Construction
 |
 |
| Sturdy | Sturdier |
 |
 |
| Castor Wheel at Rear | 5 to 1 Gear Ratio |
 |
 |
| 5 to 3 Gear Ratio | Uneven Terrain Vehicle |
 |
 |
| 4 Legged Walker | Castor Using Wheel |
|
|
|
| Castor Using Ball |
Construction
|
|
| Sturdy | Sturdier |
|
|
| Castor Wheel at Rear | 5 to 1 Gear Ratio |
|
|
| 5 to 3 Gear Ratio | Uneven Terrain Vehicle |
|
|
| 4 Legged Walker | Castor Using Wheel |
|
|
|
| Castor Using Ball |